Komatsu PC450-8 Operation & Maintenance Manual page 446

DEMOLITION DIGGING BOOM INSTALLATION AND REMOVAL
3. Make sure all of the exposed wear surfaces of the demolition
digging boom and demolition first boom are clean and show-
ing no signs of damage.
Do not extend the boom raise cylinders to lift the Digging
Equipment Support off the ground. It may cause damage
and serious injury.
4. Carefully approach the digging equipment, taking care not to
strike it with the machine. Raise the demolition boom 1 to
connect with the upper pin of the demolition digging boom, so
that the weight of the digging equipment is supported by the
demolition first boom.
5. Withdraw the spring pins connecting the Support Braces
(Item 3) of the digging equipment stand to the Left and Right
Support (Items 1 and 2).
6. Withdraw the pins connecting the Support Braces (Item 3) to
Left and Right Support (Item 1 and 2).
7. Withdraw the spring pins from the pins connecting the digging
boom to the Left and Right Support.
8. Withdraw the pins connecting the digging boom to the Left
and Right Support.
REMARK
It may be necessary to adjust the position of the boom raise cylin-
ders to allow easy withdrawal of the pins.
9. Store the components of the work equipment stand in a safe
and clean environment.
10. Raise the boom so that the digging equipment rotates around
the upper pin. Continue lifting the boom until the required
lower bore in the digging boom is aligned with the hydrauli-
cally adjusting pins of the demolition first boom.
Make sure that the changeover valve on the demolition first
boom is set to "Pin Retract".(C - no power to hydraulic pins;
D - power to hydraulic pins).
7-36
WARNING
WARNING
HIGH REACH DEMOLITION EQUIP-
Lift to attach boom
Lift to rotate boom
Rotation
SLOWLY